Digimon: Digital Monsters

Marcus tries to hide Agumon from DATS in his house, but DATS quickly concludes that he is there, so they send Yoshi to investigate. Marcus's family comes into contact with Agumon, and they all quickly become friends, much to Marcus' annoyance. In the meantime, a Kunemon appears at Kristy's (Marcus's sister) school, takes over a young boy, and evolves to Flymon, forcing both Marcus and Yoshi to fight it.